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Author Topic: 1974 cb750 four- engine (fins) clean  (Read 1388 times)

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Offline Moyston

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1974 cb750 four- engine (fins) clean
« on: November 03, 2019, 03:14:19 AM »
Hi, im in the process ove stripped the whole bike and im into cleaning bits up. Im about to tackle the engine fins, as there is a lost of crud in between them. as they are brittle and ive never cleanded  this style of engine...looknig for best results...what is the best way to clean in between . im not looking to get shiny, as it will be painted...any advice or best ways...thanks in advance
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Offline SF

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Re: 1974 cb750 four- engine (fins) clean
« Reply #1 on: November 03, 2019, 05:37:15 AM »
When you rebuild the engine get everything vapor blasted.


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Offline Moyston

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Re: 1974 cb750 four- engine (fins) clean
« Reply #2 on: November 03, 2019, 11:36:31 PM »
it is an option, and other media blasting, thanks
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Offline Stev-o

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Re: 1974 cb750 four- engine (fins) clean
« Reply #3 on: November 04, 2019, 06:38:27 AM »
I typically start by cleaning the entire motor with Gunk Foamy Engine Cleaner, not sure if it is available in Oz, but you prolly should have a comparable product...

https://shop.advanceautoparts.com/p/gunk-engine-brite-engine-cleaner-foamy-feb1/7040326-p?product_channel=local&store=6799&adtype=pla&product_channel=local&store_code=6799&gclid=Cj0KCQiAtf_tBRDtARIsAIbAKe02_aecpBa2egrmlZUYmAaOTmGy8r44rrTeTM47R2n16YL7atT0pRwaAlenEALw_wcB&gclsrc=aw.ds

Vapor blasting is great but the engine would need to be totally disassembled.  IMO that is overkill if it will be painted as it leaves a great finish.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Moyston

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Re: 1974 cb750 four- engine (fins) clean
« Reply #4 on: November 05, 2019, 02:44:43 AM »
yes we have that..its $43 !!!...but the idea made me begin to look in right direction for some other products. Im rebuilding this bike and besides trying to limit what I spend, I want to be able to do all the stuff myself without sending it off ...right done to cleaning with a toothbrush...ive done a few newer bikes engines etc and brought them back..but never a complete one like this will be...silly question i know, how to clean engine fins....lol..but tips was what after...so thankyou...you have at least sent me down the right road!...
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Offline jgger

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Re: 1974 cb750 four- engine (fins) clean
« Reply #5 on: November 05, 2019, 05:34:38 AM »
If you are scrubbing things clean, then a gun cleaning brush and a cleaning rod works well.
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Offline Stev-o

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Re: 1974 cb750 four- engine (fins) clean
« Reply #6 on: November 05, 2019, 06:33:02 AM »
Quote from: jgger on November 05, 2019, 05:34:38 AM
If you are scrubbing things clean, then a gun cleaning brush and a cleaning rod works well.

Yes, and a hand held wire brush too...

http://www.josco.com.au/product/josco-3-row-stainless-steel-hand-brush-long-handle/
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Moyston

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Re: 1974 cb750 four- engine (fins) clean
« Reply #7 on: November 06, 2019, 03:59:01 AM »
Quote from: Stev-o on November 05, 2019, 06:33:02 AM
Quote from: jgger on November 05, 2019, 05:34:38 AM
If you are scrubbing things clean, then a gun cleaning brush and a cleaning rod works well.

thats the trick!

Yes, and a hand held wire brush too...

got that...righto..all thanks, im on my way now!

http://www.josco.com.au/product/josco-3-row-stainless-steel-hand-brush-long-handle/
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